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Old 03-30-2009, 12:47 AM   #66
kovidgoyal
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Quote:
Originally Posted by garweyne View Post
Yes, it is. Use a standard cryptographic hash function, for example MD5 or SHA1 (available e.g. in openssl) and it will generate a hex string like 341e5d61ce55df379493267c1926796b1d1fcbb9 uniquely identifying your file content. Unique not only for every ebook file, for every file ever created.
Google MD5 collisions and Shannon's noiseless channel coding theorem
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